Rest Area
0 mi from route
Trip from Port Isabel, TX to Austin, TX
Pin this tripCompiled and reviewed by the US Trip Planner planning team at COD Solutions Oy · Last reviewed Jul 19, 2026 · Editorial standards
Drive Time
6h 50m
Distance
362.9 mi
584 km
Drive Score
9/10
Great drive
Same Day?
Yes, doable
Fuel Cost
$50
one way
EV Charging
Unknown
Best Time to Leave
4 AM
6h 39m
★
6 AM
6h 51m
8 AM
7h 14m
10 AM
6h 59m
12 PM
6h 57m
3 PM
7h 0m
5 PM
7h 13m
8 PM
6h 44m
Estimated drive times based on typical traffic patterns. Actual times may vary with weather, construction, and real-time conditions.
Port Isabel, TX
Griffin Wooldridge
Austin, TX
Wikimedia Commons
Trip Overview
This 362.9-mile drive from Port Isabel, TX to Austin, TX will take approximately 6 hours and 50 minutes, making it a feasible day trip. You'll primarily travel on US 281 and U.S. Highway 77, with a portion on the Purple Heart Trail. With a highway share of 71%, expect a highway-focused experience. The estimated fuel cost for this journey is around $55. Both your origin and destination are within the Great Plains region, so you won't be crossing major geographic boundaries on this relatively straightforward Texas traverse. This route is best suited for a single-day adventure, allowing you to reach Austin without needing an overnight stop.
Trip Pace
Same-day drive is realistic
A same-day return is possible, but it will make for a full day on the road.
Break Rhythm
1 planned break
Plan on a short reset every 3 to 4 hours to stay fresh behind the wheel.
Midpoint
181.5 miles from Port Isabel, TX
A natural place for your longest stop of the day , about 3h 29m into the drive .
Main Roads
| Road | Distance | Duration |
|---|---|---|
| US 281 | 115.2 mi | 2h 4m |
| U.S. Highway 77 | 102 mi | 1h 53m |
| Purple Heart Trail | 58.6 mi | 1h 3m |
| Nueces Street | 14.7 mi | 18m |
| West King Avenue | 14.5 mi | 17m |
| TX 48 | 14.1 mi | 15m |
| Connally Loop | 10.6 mi | 12m |
| North Pan Am Expressway | 10.2 mi | 11m |
Longest stretch:
US 281
— 115.2 mi, about 2h 4m
Traffic on I-35
Hour-of-day weekday pattern from 14 FHWA count stations on your route.
Peak
3 PM
~4,203 veh/hr typical
Quietest
3 AM
~766 veh/hr
Peak-to-quiet ratio
5.5×
busier at peak than in the quiet hours
12a
6a
noon
6p
11p
Averaged across 51 weeks of 2023 FHWA Travel Monitoring Analysis System data. Weekday hours only (Mon–Fri).
Turn-by-Turn Driving Directions
Step-by-step road directions between Port Isabel, TX and Austin, TX.
1
Start on South Musina Street
0.2 mi
·
33 sec
·
South Musina Street
2
Turn left onto TX 100
0.1 mi
·
23 sec
·
West Queen Isabella Boulevard
3
Turn straight onto TX 100
1.0 mi
·
2 min
·
State Highway 100
Use the left lane.
4
Turn left onto TX 48
14 mi
·
15 min
·
TX 48
Use the left lane.
5
Take the exit
0.2 mi
·
22 sec
Toward TX 550
Use the straight / slight right lanes.
6
Keep slight right at fork
47 ft
·
1 sec
Toward TX 550
Use the straight / left / right lanes.
7
Turn right onto TX 550 Toll
3.6 mi
·
3 min
·
State Highway 550
8
Continue on FM 511
1.9 mi
·
2 min
·
FM 511
9
Continue on I 169; TX 550 Toll
0.9 mi
·
58 sec
·
I-169, TX 550 Toll
10
Continue on I 169; TX 550 Toll
3.6 mi
·
3 min
·
Interstate 169
11
Merge onto I 69E; US 77; US 83
2.2 mi
·
2 min
·
North Expressway
12
Continue on I 69E; US 77; US 83
102 mi
·
1 hr 53 min
·
U.S. Highway 77
Use the straight / slight right lanes.
13
Keep slight right at fork
0.1 mi
·
8 sec
14
Keep slight right at fork
0.7 mi
·
1 min
15
Turn left onto FM 772
0.2 mi
·
17 sec
·
FM 772
16
Turn straight onto US 77 Business
4.4 mi
·
7 min
·
South 6th Street
17
Turn left onto TX 141
14 mi
·
17 min
·
West King Avenue
18
Take the ramp
0.6 mi
·
1 min
19
Merge onto US 281
54 mi
·
1 hr 1 min
·
US 281
20
Keep slight left at fork onto US 281
15 mi
·
18 min
·
Nueces Street
21
Continue on US 281
0.2 mi
·
15 sec
·
US 281
22
Take the exit onto US 281
61 mi
·
1 hr 2 min
·
US 281
Use the straight / slight right lanes.
23
Take the exit
0.2 mi
·
23 sec
Exit 133
Toward I 410, TX 130, US 281 South
Use the slight right lane.
24
Keep slight right at fork
0.5 mi
·
58 sec
Toward I 410 North, TX 130 North
Use the slight left / slight right lanes.
25
Merge onto I 410; TX 130
11 mi
·
12 min
·
Connally Loop
Use the straight / slight right lanes.
26
Merge onto I 35; I 410
2.8 mi
·
3 min
·
North Pan Am Expressway
Use the straight / slight right lanes.
27
Keep slight left at fork onto North Pan Am Expressway
7.4 mi
·
8 min
·
North Pan Am Expressway
Toward I 35: Austin
Use the straight / slight right lanes.
28
Continue on I 35
12 mi
·
12 min
·
Purple Heart Trail
Use the straight / slight right lanes.
29
Continue on I 35
1.9 mi
·
2 min
·
Interstate Highway 35
Use the straight / slight right lanes.
30
Continue on I 35
47 mi
·
50 min
·
Purple Heart Trail
Use the straight / slight right lanes.
31
Take the exit
0.1 mi
·
24 sec
Exit 234C
Toward 6th - 12th Streets
Use the slight right lane.
32
Turn left onto East 6th Street
0.5 mi
·
1 min
·
East 6th Street
33
Turn left onto Congress Avenue
357 ft
·
17 sec
·
Congress Avenue
34
Turn left onto East 5th Street
28 ft
·
0 sec
·
East 5th Street
Use the left lane.
35
Arrive at destination
East 5th Street
Trip Plan
For this 362.9-mile trip, departing Port Isabel early in the morning is advisable to maximize daylight and arrive in Austin with time to spare. The recommended single-day duration means you'll want to plan for one significant stop, perhaps around the halfway point or where you transition onto US 281. Be mindful of the longest stretch of 115.2 miles on US 281; ensure you have adequate fuel before embarking on this segment. With a $55 fuel cost estimate, keeping an eye on your gauge is practical. Since this is a manageable drive, you have flexibility, but planning your fuel and a brief rest stop will make the 6 hours and 50 minutes more comfortable.
Morning Departure
Start early — leave by 6-7 AM to arrive at a reasonable hour.
Evening Departure
This is a long drive — plan for a morning departure or consider splitting it into two days.
You can normally do this drive in one day.
Plan roughly 1 meaningful break for fuel, food, and rest.
The halfway point lands around 181.5 miles from Port Isabel, TX, or about 3h 29m into the drive.
The longest continuous stretch on this route runs about 115.2 miles.
This is a comfortable same-day trip.
Departure
Before you leave
Start with fuel, water, and navigation already sorted so the first hour feels easy.
First stop
Around 80 miles or 1h 30m in
Use this first pause for coffee, a restroom break, and a quick traffic check ahead.
Halfway reset
Around 181.5 miles or 3h 29m in
This is the best place for your longest stop, a real meal, and a full fuel check.
Final approach
Final hour starts around 5h 44m
Traffic, exits, and arrival timing usually matter more near Austin, TX than in the middle of the route.
Before You Leave
+
Open the route before leaving Port Isabel, TX so your first major turns are already loaded.
+
Leave with enough water and a charging cable within reach, not packed away.
+
Check your fuel range against the first long segment, especially if you are starting outside city service areas.
Day 1
Settle into the route from Port Isabel, TX
This is one driving day of about 362.9 miles and 6h 50m.
Your first comfortable stop window is around 80 miles from Port Isabel, TX.
This route can stay practical as a one-day drive if traffic stays reasonable.
Plan about 1 real break rather than only quick fuel stops.
The longest stretch is on US 281 for about 115.2 miles.
Where to Stop
Rest stops, refuel points, and overnight suggestions along this route.
Mid-route town
Meal stop
181 mi into the route
Best for: Lunch, fuel, and a longer reset
This sits close to the middle of the route, so it works well for the longest stop of the day.
Pacing Suggestions
Fuel and coffee
A short stop after about 80 miles helps settle the day before fatigue starts building.
Meal break
The midpoint is around 181.5 miles from Port Isabel, TX, which is a good place for a longer meal and fuel stop.
Before the longest stretch
Fuel checkTop up before US 281 if your tank is already low. That segment runs about 115.2 miles.
These stop ideas are pacing suggestions — the exact town or exit can change with traffic, hotel plans, and fuel range.
Stops Along Your Drive
Picked by where they fit in your drive — first break, midpoint reset, final stretch.
Picnic Area
0 mi from route
Service Plaza
0.1 mi from route
Love's Travel Stop
0.1 mi from route
Buc-ee's
0.1 mi from route
Kenedy County Rest Area
0.1 mi from route
Rest Area
0.1 mi from route
Texas Travel Information Center at Harlingen
0.1 mi from route
Live Oak County Southbound Rest Area
0.1 mi from route
Picnic Area
0.1 mi from route
Love's Travel Stop
0.1 mi from route
QuikTrip
0.1 mi from route
Road Ranger
0.1 mi from route
Service Plaza
0.1 mi from route
QuikTrip
0.1 mi from route
TA
0.2 mi from route
Pilot Travel Center
0.2 mi from route
Pilot Travel Center
0.3 mi from route
Live Oak County Northbound Rest Area
0.3 mi from route
Marlstone Retail Center
0.4 mi from route
Pilot Travel Center
0.7 mi from route
Petro Stopping Centers
0.7 mi from route
Love's Travel Stop
0.9 mi from route
TA
1.7 mi from route
Flying J Travel Center
1.8 mi from route
Love's Travel Stop
1.8 mi from route
QuikTrip
2 mi from route
Austin Bat Tours
4.4
★ ★ ★ ★ ☆
Near the end, right off the route
Home stretch
0.2 mi from route
~1 min detour
Austin, Texas
Hours: 9 am–10 pm
Visit websitePirate's Landing Fishing Pier
4.5
★ ★ ★ ★ ★
Near the start, right off the route
0.4 mi from route
~1 min detour
Port Isabel, Texas
Hours: Open 24 hours
+19569437437
Visit websitePort Isabel Historical Museum
4.5
★ ★ ★ ★ ★
Near the start, right off the route
0.2 mi from route
~1 min detour
Port Isabel, Texas
Hours: 10 am–4 pm
+19569437602
Visit websiteAnimal World & Snake Farm Zoo
4.6
★ ★ ★ ★ ★
Near the end, right off the route
Home stretch
0.8 mi from route
~2 min detour
New Braunfels, Texas
Hours: 10 am–6 pm
+18304024603
Visit websiteTreasures of the Gulf Museum
4.0
★ ★ ★ ★ ☆
Near the start, right off the route
0.2 mi from route
~1 min detour
Port Isabel, Texas
Hours: 10 am–4 pm
+19569437602
Visit websiteThe Original Dolphin Watch
4.7
★ ★ ★ ★ ★
Near the start, short detour
2.7 mi from route
~7 min detour
South Padre Island, Texas
Hours: 10 am–8 pm
+19567614243
Visit websiteIsla Tours
4.7
★ ★ ★ ★ ★
Near the start, short detour
2.7 mi from route
~7 min detour
South Padre Island, Texas
Hours: 7 am–6 pm
+19567614752
Visit websiteBotanical Gates of Paradise
4.1
★ ★ ★ ★ ☆
Near the end, short detour
Home stretch
1.7 mi from route
~4 min detour
Austin, Texas
Hours: 9 am–5 pm
Place data sourced from public business listings. Hours and availability may vary.
Heads-up: tricky spots
5 of 235 decision points cluster between mile 15.6 and 362.2 — GPS handles the exact turns, but know they're coming. Your lane choice matters more than the turn itself.
8
15.6 mi into trip
|
~19m in
Keep slight right at fork toward TX 550
Highway fork - watch signs carefully. Lane positioning matters here
Use the straight / left / right lanes.
Toward TX 550
8
280.3 mi into trip
|
~5h 17m in
Take the exit toward I 410, TX 130, US 281 South
Exit ramp - move to the correct lane early. Lane positioning matters here. Multiple destination signs - pick the right one
Use the slight right lane.
Exit 133
Toward I 410, TX 130, US 281 South
8
280.5 mi into trip
|
~5h 18m in
Keep slight right at fork toward I 410 North, TX 130 North
Highway fork - watch signs carefully. Lane positioning matters here. Multiple destination signs - pick the right one
Use the slight left / slight right lanes.
Toward I 410 North, TX 130 North
7
294.3 mi into trip
|
~5h 34m in
|
North Pan Am Expressway
Keep slight left at fork onto North Pan Am Expressway toward I 35: Austin
Highway fork - watch signs carefully. Lane positioning matters here
Use the straight / slight right lanes.
Toward I 35: Austin
7
362.2 mi into trip
|
~6h 48m in
Take the exit toward 6th - 12th Streets
Exit ramp - move to the correct lane early. Lane positioning matters here
Use the slight right lane.
Exit 234C
Toward 6th - 12th Streets
Fuel & Cost
Regular Gas
$49.71 one way
$99.41 round trip
$3.48/gal
25.4 MPG avg
127 kg CO2
| Fuel Type | $/gal | One Way | Round Trip |
|---|---|---|---|
| midgrade | $3.89 | $55.52 | $111.04 |
| premium | $4.23 | $60.36 | $120.73 |
| diesel | $4.80 | $68.52 | $137.04 |
No toll roads detected on this route.
Estimated Trip Cost (one way, 1 person)
Fuel
$50
Meals
$25–$50
Total
$75–$100
Rough estimate based on US averages. Hotel $80–$140/night, meals $25–$50/day.
Estimated CO2 emission: 127 kg one way. Prices: EIA weekly data, 2026-07-13.
Driving Electric?
About $38 in charging · 1 stop · 67% less CO2
| Vehicle Type | kWh | Stops | DC Fast | Home Charge |
|---|---|---|---|---|
| Average EV | 108.9 | 1 | $38.10 | $17.42 |
| Efficient EV | 90.7 | 1 | $31.75 | $14.52 |
| EV Truck/SUV | 145.2 | 1 | $50.81 | $23.23 |
Gas CO2
127 kg
EV CO2
42 kg (67% less)
Plan for 1 charging stop. A 30-minute DC fast charge mid-route should be enough to complete the trip comfortably.
DC fast charging avg $0.35/kWh. Home charging avg $0.16/kWh. US grid CO2: 0.39 kg/kWh.
Travel Intel
Current conditions at both ends of the drive.
Origin
Port Isabel, TX
Night in Port Isabel on Saturday
Local time
11:16 PM
CDT
Current temp
81°F
Mostly Cloudy
SSE 14 mph
0% chance
Live forecast
Flash Flood Warning
Flash Flood Warning issued July 17 at 2:45AM CDT until July 17 at 7:00AM CDT by NWS Austin/San Antonio TX
Flood Watch
Flood Watch issued July 17 at 1:45AM MDT until July 17 at 6:00PM MDT by NWS Midland/Odessa TX
Destination
Austin, TX
Night in Austin on Saturday
Local time
11:16 PM
CDT
Current temp
75°F
Mostly Cloudy
SSE 5 mph
7% chance
Live forecast
Flash Flood Warning
Flash Flood Warning issued July 17 at 2:45AM CDT until July 17 at 7:00AM CDT by NWS Austin/San Antonio TX
Flood Watch
Flood Watch issued July 17 at 1:45AM MDT until July 17 at 6:00PM MDT by NWS Midland/Odessa TX
Seasonal Notes
Summer travel usually means heavier construction, hotter rest stops, and busier weekend traffic around major cities.
Winter travel shortens daylight, so a route that looks manageable on paper can feel much longer after dark.
Holiday weekends tend to make both departure and arrival windows slower than the raw route time suggests.
Time zone
Same local time
Origin and destination are on the same clock, so arrival timing is easier to judge at a glance.
Temperature spread
6 degrees cooler at arrival
A meaningful temperature swing is a good cue to rethink layers, water, and how soon you want to arrive.
Road read
6h 50m on the road
Start early — leave by 6-7 AM to arrive at a reasonable hour.
Weather data from the National Weather Service. Conditions may change; check closer to your travel date.
National Parks Near This Route
Worth a detour if your schedule allows.
Palo Alto Battlefield National Historical Park
National Historical Park
On May 8, 1846, U.S. and Mexican troops clashed on the prairie of Palo Alto. The battle was the first in a two-year long war that changed the map of North America. Although the two countries have deve...
4 mi from route
~10 min detour
Free
near mile 24.9
View on nps.gov
San Antonio Missions National Historical Park
National Historical Park
Welcome to San Antonio Missions, a National Park Service site and the only UNESCO World Heritage Site in Texas. Each mission in the park is a center of community and has been since the early 1700s. Th...
4 mi from route
~11 min detour
Free
near mile 273.8
View on nps.gov
Padre Island National Seashore
National Seashore
Protecting sixty-six miles of wild coastline along the Gulf of America, the narrow barrier island is home to one of the last intact coastal prairie habitats in the United States. Along the hypersaline...
27 mi from route
~67 min detour
$25
near mile 99.6
View on nps.gov
Park data from the National Park Service API. Alerts update every 2 hours.
What kind of drive is this?
This drive offers a highway-focused profile, with 71% of the journey utilizing major roadways. You'll experience a significant stretch of 115.2 miles on US 281, providing an extended period of consistent travel. While predominantly highway, the route incorporates U.S. Highway 77 and the Purple Heart Trail, offering some variation. The character is likely one of steady progress, punctuated by the transitions between these main arteries. Expect a driving experience that prioritizes covering distance efficiently, rather than winding scenic byways, allowing you to maintain a good pace for most of the 6 hours and 50 minutes.
71% highway — fuel and pacing are the main things to plan.
35 navigation steps total — most of the decisions cluster near the start and finish.
Longest single stretch: 115.2 mi on US 281.
How Hard Is This Drive?
10/10
This is a straightforward highway drive that stays mostly on US 281 and U.S. Highway 77. This route has several spots where lane changes, forks, or exits need your full attention. The trickiest moment comes around 15.6 miles in.
Driving Effort
10/10
High effort - long or complex enough to need steady focus all day
Balances navigation complexity with total wheel time.
This is a demanding drive. With 23 significant decision points across 362.9 miles, you will need to stay alert - especially through interchange areas and urban stretches. Consider splitting it into segments if you are not comfortable with fast highway navigation.
Where does it get tricky?
The main spots that need attention: at 15.6 miles: Highway fork - watch signs carefully. Lane positioning matters here; at 280.3 miles: Exit ramp - move to the correct lane early. Lane positioning matters here. Multiple destination signs - pick the right one; at 280.5 miles: Highway fork - watch signs carefully. Lane positioning matters here. Multiple destination signs - pick the right one.
Elevation Profile
Mostly flat terrain
693 ft
8 ft
Total Climb
844 ft
Total Descent
366 ft
Highest Point
693 ft
~311.1 mi in
Elevation Range
685 ft
About the Cities
Starting in Port Isabel, TX
Full guide →The City of Port Isabel, population 6,300 in 2019, is the southernmost city and port on the Texas coast. It is a tourism, retirement, sports fishing and commercial fishing destination and the gateway to South Padre Island.
Top landmarks
- • Point Isabel Lighthouse — structure in Port Isabel, Cameron County, Texas
Arriving in Austin, TX
Full guide →“City of the Violet Crown” · Founded 1835
Austin is a city of about 1,054,000 (2026) surpassing Fort Worth to become the 4th most populous city in Texas. It is on the southeast edge of the Hill Country region of Texas, making it the fourth-largest city in the state and the 11th-largest in the country. It is the capital of Texas and a college town, and also a center of an alternative culture away from the major cities on the US coasts, though the city is rapidly gentrifying with its rising popularity. Austin's attitude is commonly emblazoned about town on T-shirts and bumper stickers that read: "Keep Austin Weird." Austin is also marketed as the Live Music Capital of the World due to the large number of venues.
Top landmarks
- • Texas State Capitol — capitol and seat of government of the U.S. state of Texas
- • Lyndon Baines Johnson Library and Museum — presidential library and museum for U.S. President Lyndon B. Johnson in Austin,...
- • Texas State Cemetery — historic cemetery in Austin, Texas, USA
City content from Wikivoyage (CC BY-SA 4.0) and Wikidata (CC0).
Who Is This Route For?
Weekend Trip
Doable as a same-day drive at 6h 50m. Total distance: 362.9 miles.
Family Friendly
Moderate complexity with 1 natural rest stops along the way.
Solo Traveler
6h 50m drive, plan rest stops for pacing.
Frequently Asked Questions
The longest stretch is about 115.2 miles on US 281. The full list of main roads is in the Roads section above.
Yes — we found about 27 rest areas or service plazas within a short detour of the route (from OpenStreetMap). See the Rest Stops tab under Nearby Places for locations and mile markers. Plan to stretch, use the bathroom, and top off fluids every 2–3 hours on longer drives.
It helps. This route has a higher-than-average number of complex decision points, which get harder in the dark. If the last hour of the trip is on surface roads or mountain grades, aim to arrive at Austin, TX before sunset when you can. Check the Trip Plan for departure windows that land you in daylight.
Only with planning. This is a long drive for kids — consider splitting it into two days rather than pushing through. Plan at least 1 meaningful breaks. There are 27 rest areas along the route for bathroom stops.
The main spots that need attention: at 15.6 miles: Highway fork - watch signs carefully. Lane positioning matters here; at 280.3 miles: Exit ramp - move to the correct lane early. Lane positioning matters here. Multiple destination signs - pick the right one; at 280.5 miles: Highway fork - watch signs carefully. Lane positioning matters here. Multiple destination signs - pick the right one.
Yes — Palo Alto Battlefield National Historical Park, San Antonio Missions National Historical Park and Padre Island National Seashore. See the National Parks section for detour distances and tips on detours.
Not recommended in a single day. At 6.8 hours each way, a round trip means 13.7 hours of driving — that is an unsafe level of fatigue for most drivers. Plan at least one night at Austin, TX before the return drive.
How this page is built
Compiled by the US Trip Planner planning team at COD Solutions Oy from open government datasets — OSRM over OpenStreetMap for geometry, EIA for fuel prices, USGS 3DEP for elevation, NPS for national parks, and FHWA TMAS for hourly traffic volumes. See our methodology for refresh cadence and limitations.
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